mandible and maxilla oblique radiography
TRANSCRIPT
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Mandible & maxilla oblique radiography
DINESH DARSHANARADIOLOGIC TECHNOLOGIST – SRI LANKA
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Mandible oblique
Anatomy
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According to the anatomy of mandible there are main 3 areas,
Symphysis menti area
Mandible body area
Ramus area
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How to demonstrate mandible in a radiograph?It is too hard to clearly demonstrate above 3
areas in one projection.
So there are 3 separate projections to demonstrate interested anatomy.
Interested area should be parallel to IR.
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Patient positioning..Patient is standing or sitting next to the upright buckyPlace head in a lateral position with side of interest
against IRIf possible have patient close mouth and bring teeth
together Extend neck (to clear the mandible of the cervical
spine)Rotate the head in an oblique direction (the degree of
obliquity depend upon the section of manible that is of interest) - the area of interest should be positioned parrallel to the IR
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How to position the mandible?Head in true lateral position demonstrates ramus
30° rotation demonstrates body
45 ° rotation demonstrates mentum
10° to 15° rotation provides a general survey of mandible
CR angled 25° cephalad
Direct CR to exit mandibular region of interest
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Positioning for Ramus
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How the image looks like
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Axiolateral Oblique – Body 30°Start from true lateralOblique head 30°
towards IR25° CR angleCR will exit body on
opposite side of mandible
Collimate to mandible on all sides
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Positioning for menti
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How image looks like…
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mandible Oblique- General Survey 10° - 15°
Oblique head 10°-15° towards IR
CR angled 25° cephalad
Area of interest should be demonstrated w/minimal superimposition & foreshortening
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Mandible oblique for trauma patients
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15- 15 method mandible oblique
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If the patient cant keep stand etrect
The central ray is angled 30 degrees cranially and is centred 5 cm inferior to theangle of the mandible remote from the cassette.
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Other projections to demonstrate mandibleMandible PAOPGRevers Towns viewTrue Occlusal of mandible to demonstrate
Menti.CT
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Maxilla oblique Occlusal
The X-ray tube is positioned towards the side of the face where pathology is suspected and angled downwards (caudad) at 65–70 degrees through the cheek.
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THANK YOU